Overview

Comprehensive Description

Biology

A common krill of the subarctic Atlantic and Pacific, and adjacent Arctic seas
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Transparent, yellowish if rich in lipids, females might develop blue hue when spawning; Eyes round, rostrum pointed, photophores red; Anntennae lack lappet, carapace without denticle; well-developed spine on 6th abdominal segment
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Distribution

depth in m: 200-300; horizontal distribution: amphiboreal species, N Pacific, N Atlantic
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Source: World Register of Marine Species

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Arctic to Gulf of Maine
  • North-West Atlantic Ocean species (NWARMS)
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Source: World Register of Marine Species

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Amphiboreal species; found in the Barents Sea, White Sea, Kara Sea, Bering Sea, Sea of Okhotsk.

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Physical Description

Morphology

The last segment of the abdomen carries a dorsal spine. The front edge of the carapace is transformed into an elongate rostrum. Uropods are shorter than the telson.

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Size

Length up to 30 mm.

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Diagnostic Description

Differs from other Thysanoessa species by the presence of a dorsal spine on the last segment of the abdomen.

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Ecology

Habitat

upper and glacial epipelagic regions of the Gulf and estuary, and the upper Mesopelagic of the Gulf and estuary
  • North-West Atlantic Ocean species (NWARMS)
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Depth range based on 681 specimens in 2 taxa.
Water temperature and chemistry ranges based on 509 samples.

Environmental ranges
  Depth range (m): 0 - 875
  Temperature range (°C): -1.589 - 12.863
  Nitrate (umol/L): 0.367 - 34.597
  Salinity (PPS): 25.948 - 35.590
  Oxygen (ml/l): 4.017 - 9.281
  Phosphate (umol/l): 0.182 - 2.965
  Silicate (umol/l): 2.327 - 72.502

Graphical representation

Depth range (m): 0 - 875

Temperature range (°C): -1.589 - 12.863

Nitrate (umol/L): 0.367 - 34.597

Salinity (PPS): 25.948 - 35.590

Oxygen (ml/l): 4.017 - 9.281

Phosphate (umol/l): 0.182 - 2.965

Silicate (umol/l): 2.327 - 72.502
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Subarctic in deeper coastal waters and shelf breaks; Common in Arctic waters near Pacific or Atlantic inflows, uncommon in central basins; Undergo diel vertical migrations, spending daytime near bottom or to maxiamum of ~500 m, night-time in surface waters
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Trophic Strategy

Primarily herbivourous, may feed on detritous when food scarse; During open-water periods feed on phytoplankton when abundant (shifting to small zooplankton when phyoplankton less abundant); An important prey item for fish, birds, seals and whales
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Life History and Behavior

Life Cycle

Females lay several clutches of eggs (140 per brood on average) during spring; Females require repeated mating after each molt to form new egg clutches; Life cycles is typcial: eggs, nauplius, metanauplius, followed by several stages of feeding calytopsis, and furcillia larvae; Juveniles resemble adults, and molt regularly while growing to adulthood over the first year of life; Life expectancy not known, likely 1-2 years
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Thysanoessa inermis

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 7
Species With Barcodes: 1
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Source: Barcode of Life Data Systems (BOLD)

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Relevance to Humans and Ecosystems

Benefits

Uses

Important food source for herring.

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